Align accessibility IDs with elementX android (#567)

* Rename onboarding and login user/pass accessibility ids.

* Refactor remaining server change accessibility IDs

* Avoid accessibilityIdentifier spreading to all decorations on the textBox.

Required because otherwise there are multiple items tagged with the accessibilityId
which means we can't click on "the" item.

* Move all accessibility identifiers to `AccessibilityIdentifiers.swft`
- use same naming convention on all of them
- remove the unused ones
- fix build errors in integration tests and invalid identifiers (still broken until autodiscovery lands on rosa)

---------

Co-authored-by: Stefan Ceriu <stefanc@matrix.org>

ElementX/Sources/Screens/Settings/View/SettingsScreen.swift

@@ -86,7 +86,6 @@ struct SettingsScreen: View {
                                image: Image(systemName: "checkmark.shield")) {
                 context.send(viewAction: .sessionVerification)
             }
-            .accessibilityIdentifier("sessionVerificationButton")
         }
     }
     
@@ -147,7 +146,6 @@ struct SettingsScreen: View {
 
     private var doneButton: some View {
         Button(ElementL10n.done, action: close)
-            .accessibilityIdentifier("closeButton")
     }
 
     private func close() {